e_sinhf.c revision 50476
12116Sjkh/* e_sinhf.c -- float version of e_sinh.c. 22116Sjkh * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 32116Sjkh */ 42116Sjkh 52116Sjkh/* 62116Sjkh * ==================================================== 72116Sjkh * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 82116Sjkh * 92116Sjkh * Developed at SunPro, a Sun Microsystems, Inc. business. 102116Sjkh * Permission to use, copy, modify, and distribute this 118870Srgrimes * software is freely granted, provided that this notice 122116Sjkh * is preserved. 132116Sjkh * ==================================================== 142116Sjkh */ 152116Sjkh 162116Sjkh#ifndef lint 1750476Speterstatic char rcsid[] = "$FreeBSD: head/lib/msun/src/e_sinhf.c 50476 1999-08-28 00:22:10Z peter $"; 182116Sjkh#endif 192116Sjkh 202116Sjkh#include "math.h" 212116Sjkh#include "math_private.h" 222116Sjkh 232116Sjkh#ifdef __STDC__ 242116Sjkhstatic const float one = 1.0, shuge = 1.0e37; 252116Sjkh#else 262116Sjkhstatic float one = 1.0, shuge = 1.0e37; 272116Sjkh#endif 282116Sjkh 292116Sjkh#ifdef __STDC__ 302116Sjkh float __ieee754_sinhf(float x) 312116Sjkh#else 322116Sjkh float __ieee754_sinhf(x) 332116Sjkh float x; 342116Sjkh#endif 358870Srgrimes{ 362116Sjkh float t,w,h; 372116Sjkh int32_t ix,jx; 382116Sjkh 392116Sjkh GET_FLOAT_WORD(jx,x); 402116Sjkh ix = jx&0x7fffffff; 412116Sjkh 422116Sjkh /* x is INF or NaN */ 438870Srgrimes if(ix>=0x7f800000) return x+x; 442116Sjkh 452116Sjkh h = 0.5; 462116Sjkh if (jx<0) h = -h; 472116Sjkh /* |x| in [0,22], return sign(x)*0.5*(E+E/(E+1))) */ 482116Sjkh if (ix < 0x41b00000) { /* |x|<22 */ 492116Sjkh if (ix<0x31800000) /* |x|<2**-28 */ 502116Sjkh if(shuge+x>one) return x;/* sinh(tiny) = tiny with inexact */ 512116Sjkh t = expm1f(fabsf(x)); 522116Sjkh if(ix<0x3f800000) return h*((float)2.0*t-t*t/(t+one)); 532116Sjkh return h*(t+t/(t+one)); 542116Sjkh } 552116Sjkh 562116Sjkh /* |x| in [22, log(maxdouble)] return 0.5*exp(|x|) */ 572116Sjkh if (ix < 0x42b17180) return h*__ieee754_expf(fabsf(x)); 582116Sjkh 592116Sjkh /* |x| in [log(maxdouble), overflowthresold] */ 602116Sjkh if (ix<=0x42b2d4fc) { 612116Sjkh w = __ieee754_expf((float)0.5*fabsf(x)); 622116Sjkh t = h*w; 632116Sjkh return t*w; 642116Sjkh } 652116Sjkh 662116Sjkh /* |x| > overflowthresold, sinh(x) overflow */ 672116Sjkh return x*shuge; 682116Sjkh} 69